This is a fundraiser to raise money for worthy causes.
Here's some more information about it:
Amigos de Si'an Kaan is a wonderful NGO in Mexico (my current home) that works in many different realms of conservation and community empowerment. GVI (my employer) is a partner of Amigos and has organized a three day,140km biking challenge in the jungle to raise funds for two current Amigos programs. One is to build a recycling center in a small fishing town called Punta Allen, and the other is to train local fishermen in reef health monitoring to promote sustainable fishing practices.
Please support the organizer's efforts by donating to one of the projects below.